An adjuster and response handler element that lets the subject adjust properties of other elements by key press. Also works with other keyboard-like devices. Use property deltas to assign keys to adjustment values.

Response values generated are adjusted property value(s).

"Ends on its own" means ends automatically at that point. If an element can end on its own, you don't need to set end conditions for it in property end (unless you want it to maybe end earlier).

deltas

No default

A 2-column cell array with each row assigning a key or key combination (e.g. Shift + Left) to an adjustment value:

{column 1} A string that is key name, or an array of strings for a key combination. Key names are common across operating systems. To get them you can use the tool showKey at the MATLAB command line (type help showKey for usage, but basically press a key to see its name or use inputs to get all key names). Alternatively you can use a number or vector of numbers that are key numbers. These are the same as used by Psychtoolbox functions like KbCheck. Note key numbers are different across operating systems. showKey also shows key numbers.

{column 2} Numeric value (not necessarily scalar) that is adjustment to apply when the key(s) are pressed.

Use adjust to set where and how adjustments are applied.

responseKeyName

Default: Enter

A string that is key name for the subject to say they are done adjusting (a "response"). Or a number for a key number. See deltas above about key names/numbers.

repeatDelay
repeatRate

Default: repeatDelay = 0.5 sec
Default: repeatRate = 4 adjustments/sec

repeatDelay is delay before starting to repeat adjustments when subject holds key(s) down (sec).

repeatRate is adjustment repeat rate (adjustments/sec).

n_device

Default: listen to all attached keyboards

If you want to narrow down which device to listen to, you can set a HID device number here. Use Psychtoolbox functions GetKeyboardIndices or PsychHID('Devices') to see available device numbers.

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